This article asking can concrete cancer be fixed has been supplied and written by BRS Building Rectification Services.
In a widespread awareness campaign, the Gold Coast City Council along with Queensland’s strata title authorities including Strata Community Association, have suggested that over the next few years, issues with the structural integrity of many buildings built 40 years ago will need immediate repair to stay structurally sound for commercial and private use.
Concrete cancer, or spalling concrete as it’s sometimes referred to, is caused by the corrosion of steel in concrete.
So how does this occur?
Three key ingredients cause concrete cancer – Iron, Water and Oxygen, and the process starts when:
- Moisture hits the internal steel iron, and combines with the carbon dioxide in the air, forming weak carbonic acid.
- As this acid forms, it causes the iron to dissolve, allowing water to start breaking down its components – hydrogen and oxygen.
- This then forms an oxygen and iron bond freeing electrons, creating what is commonly known as rust.
Highrise apartment buildings built back in the 1970s have been the hot topic of discussion, as the effects of concrete cancer are starting to show, some with disastrous outcomes.
We all remember the iconic Iluka building in Surfers Paradise back when Meter Maids were the hot topic on the tourist strip. The Iluka building was the first multi-storey apartment block to cast shadows along Surfers Paradise beach. After more than 40 years of standing proud, it was demolished in 2013 because of concrete cancer destroying the structural integrity of the building.
This was the same reason Brisbane’s City Hall was closed for two years over 2012 and 2013. The Brisbane City Council spent over $215 million to preserve the heritage listed dwelling.
What are key signs to look out for?
It’s not always obvious what underlying problems are in a concrete structure, however cracking, honeycombing and spalling are relatively easy to locate. The real concern is the root of the problem and without proper technical support can be easily overlooked.
Things to look for are:
- Reddish/brown stains that are adjacent to cracked concrete or running down any part of a building.
- Concrete lifting/exploding out.
- Other cracks with signs of moisture coming through, they can sometimes look like white crystals or fluorescence.
Can Concrete Cancer Be fixed?
If you have identified any issues like mentioned above, you need to get the professionals involved. BRS have many years’ experience in structural and cosmetic concrete repairs giving them the ability to refine the best suitable concrete refurbishment method for each project.
The process to fix Concrete Cancer can be long and most times if left unattended quite expensive. Things BRS consider are:
- Determine what is causing the problem
- Evaluate the severity of the damage i.e. classification, major/minor
- Determine the repair or rebuilding method
- Preparation of existing concrete and steel. Sometimes inclusive of additional reinforcing steel anodes
- Formwork and repair products
- Allow for proper curing of the repairs. Often includes specialist coatings
- Finishing and making good to original, profiles, textures, paints and protective coatings
- Establish a site-specific manual, recording the details of repaired areas
- Protection of the concrete is essential in reducing further external influences
- Queensland cladding laws: The cladding bus has left the station
- NSW: Q&A Strata Committee Conflict of Interest Over Concrete Cancer Repairs?
This post appears in Strata News #128
For more information on how BRS Building Rectification Services can help you with Concrete Repair or any other services, please call BRS Building Rectification Services (07) 5539 3588 or email [email protected]
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